Electrocardiography is the process of producing an electrocardiogram. It is a graph of voltage versus time of the electrical activity of the heart using electrodes placed on the skin. Thus,ECG cable acts as a necessary route between human body and ECG machine, there are two reasons to add a resistor inside the wire of ECG cable :
1. To avoid EMI/RFI between each party. 2. For safety to limit any current to the patient in case of some sort of equipment failure.

The protective component(SSWA) must have sufficient capability to stand energy of defibrillator pulses but also to stand possible ESD pulses without specification degradation while maintaining high reliability during the lifetime of the components.

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